{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:2NSZHWUYFWBG3BCKCMMNY3NY4X","short_pith_number":"pith:2NSZHWUY","canonical_record":{"source":{"id":"2606.07692","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2026-06-05T07:07:13Z","cross_cats_sorted":["cs.AI","cs.ET"],"title_canon_sha256":"5985d48b2183e8adf622262109ebcff1a4e8e390048dd9deee1856d65741f4d0","abstract_canon_sha256":"423419a092e9d636b3573d41098b145a1ad45b0ea1cf10146e3f75a09892c311"},"schema_version":"1.0"},"canonical_sha256":"d36593da982d826d844a1318dc6db8e5da17f26ecce97c22ff5a97d8cb49d164","source":{"kind":"arxiv","id":"2606.07692","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.07692","created_at":"2026-06-09T00:04:47Z"},{"alias_kind":"arxiv_version","alias_value":"2606.07692v1","created_at":"2026-06-09T00:04:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.07692","created_at":"2026-06-09T00:04:47Z"},{"alias_kind":"pith_short_12","alias_value":"2NSZHWUYFWBG","created_at":"2026-06-09T00:04:47Z"},{"alias_kind":"pith_short_16","alias_value":"2NSZHWUYFWBG3BCK","created_at":"2026-06-09T00:04:47Z"},{"alias_kind":"pith_short_8","alias_value":"2NSZHWUY","created_at":"2026-06-09T00:04:47Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:2NSZHWUYFWBG3BCKCMMNY3NY4X","target":"record","payload":{"canonical_record":{"source":{"id":"2606.07692","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2026-06-05T07:07:13Z","cross_cats_sorted":["cs.AI","cs.ET"],"title_canon_sha256":"5985d48b2183e8adf622262109ebcff1a4e8e390048dd9deee1856d65741f4d0","abstract_canon_sha256":"423419a092e9d636b3573d41098b145a1ad45b0ea1cf10146e3f75a09892c311"},"schema_version":"1.0"},"canonical_sha256":"d36593da982d826d844a1318dc6db8e5da17f26ecce97c22ff5a97d8cb49d164","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-09T00:04:47.010635Z","signature_b64":"90p6MZeMzSjj748bV+y7PVtGEgtNwXKzmEuyxaiI5CVu1Wx1H1HyiPKyssTN7/JLIhqwFGUpbkOiEA1i67CsBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d36593da982d826d844a1318dc6db8e5da17f26ecce97c22ff5a97d8cb49d164","last_reissued_at":"2026-06-09T00:04:47.010232Z","signature_status":"signed_v1","first_computed_at":"2026-06-09T00:04:47.010232Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.07692","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-06-09T00:04:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JlfyVD+h7ATW3yPKlLuZFrltUi6+zvOjy3b46S5PCDJjAK9xkVc1NMHfw34b5emYuFFH3qngVzzNq7xIHBYOCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T10:58:48.540891Z"},"content_sha256":"7cf41afa496aff26d4d4ddfe1339f1acaf03064286702fc9f6e30a230a3277d2","schema_version":"1.0","event_id":"sha256:7cf41afa496aff26d4d4ddfe1339f1acaf03064286702fc9f6e30a230a3277d2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:2NSZHWUYFWBG3BCKCMMNY3NY4X","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"BCG-FM: A Foundation Model for Ambient Cardiac Health Sensing","license":"http://creativecommons.org/licenses/by-sa/4.0/","headline":"","cross_cats":["cs.AI","cs.ET"],"primary_cat":"cs.LG","authors_text":"Ashish Neupane, David Q. Sun, Haejun Han, Magnus Ruud Kjaer","submitted_at":"2026-06-05T07:07:13Z","abstract_excerpt":"Foundation models for wearable biosignals have matched or exceeded supervised specialists across a range of clinical tasks, yet all rely on modalities that require deliberate user action--wearing a device or visiting a sleep lab. We introduce BCG-FM, the first foundation model for ambient mechanical biosignals. A piezoelectric sensor embedded in the bed surface records ballistocardiography (BCG) each night without user effort; we pretrain BCG-FM with participant-level contrastive learning and using a total of 2.75 million hours of nightly recordings from 145,985 individuals, the largest raw-wa"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.07692","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.07692/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-06-09T00:04:47Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"6K2Es6BHir7ks1HGrYUDrTzEZ3bhdFtFTZ/xtNgv4T+LlN+wo9raQY4JutZyOxiP7MzdbwHGVpOqLFGVIhdmCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-02T10:58:48.541265Z"},"content_sha256":"1d2f605dfb59861a9db63b829d192d9a13e8b863e83954d398833d91de4febbc","schema_version":"1.0","event_id":"sha256:1d2f605dfb59861a9db63b829d192d9a13e8b863e83954d398833d91de4febbc"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/2NSZHWUYFWBG3BCKCMMNY3NY4X/bundle.json","state_url":"https://pith.science/pith/2NSZHWUYFWBG3BCKCMMNY3NY4X/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/2NSZHWUYFWBG3BCKCMMNY3NY4X/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-07-02T10:58:48Z","links":{"resolver":"https://pith.science/pith/2NSZHWUYFWBG3BCKCMMNY3NY4X","bundle":"https://pith.science/pith/2NSZHWUYFWBG3BCKCMMNY3NY4X/bundle.json","state":"https://pith.science/pith/2NSZHWUYFWBG3BCKCMMNY3NY4X/state.json","well_known_bundle":"https://pith.science/.well-known/pith/2NSZHWUYFWBG3BCKCMMNY3NY4X/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:2NSZHWUYFWBG3BCKCMMNY3NY4X","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"423419a092e9d636b3573d41098b145a1ad45b0ea1cf10146e3f75a09892c311","cross_cats_sorted":["cs.AI","cs.ET"],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2026-06-05T07:07:13Z","title_canon_sha256":"5985d48b2183e8adf622262109ebcff1a4e8e390048dd9deee1856d65741f4d0"},"schema_version":"1.0","source":{"id":"2606.07692","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.07692","created_at":"2026-06-09T00:04:47Z"},{"alias_kind":"arxiv_version","alias_value":"2606.07692v1","created_at":"2026-06-09T00:04:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.07692","created_at":"2026-06-09T00:04:47Z"},{"alias_kind":"pith_short_12","alias_value":"2NSZHWUYFWBG","created_at":"2026-06-09T00:04:47Z"},{"alias_kind":"pith_short_16","alias_value":"2NSZHWUYFWBG3BCK","created_at":"2026-06-09T00:04:47Z"},{"alias_kind":"pith_short_8","alias_value":"2NSZHWUY","created_at":"2026-06-09T00:04:47Z"}],"graph_snapshots":[{"event_id":"sha256:1d2f605dfb59861a9db63b829d192d9a13e8b863e83954d398833d91de4febbc","target":"graph","created_at":"2026-06-09T00:04:47Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2606.07692/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Foundation models for wearable biosignals have matched or exceeded supervised specialists across a range of clinical tasks, yet all rely on modalities that require deliberate user action--wearing a device or visiting a sleep lab. We introduce BCG-FM, the first foundation model for ambient mechanical biosignals. A piezoelectric sensor embedded in the bed surface records ballistocardiography (BCG) each night without user effort; we pretrain BCG-FM with participant-level contrastive learning and using a total of 2.75 million hours of nightly recordings from 145,985 individuals, the largest raw-wa","authors_text":"Ashish Neupane, David Q. Sun, Haejun Han, Magnus Ruud Kjaer","cross_cats":["cs.AI","cs.ET"],"headline":"","license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2026-06-05T07:07:13Z","title":"BCG-FM: A Foundation Model for Ambient Cardiac Health Sensing"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.07692","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:7cf41afa496aff26d4d4ddfe1339f1acaf03064286702fc9f6e30a230a3277d2","target":"record","created_at":"2026-06-09T00:04:47Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"423419a092e9d636b3573d41098b145a1ad45b0ea1cf10146e3f75a09892c311","cross_cats_sorted":["cs.AI","cs.ET"],"license":"http://creativecommons.org/licenses/by-sa/4.0/","primary_cat":"cs.LG","submitted_at":"2026-06-05T07:07:13Z","title_canon_sha256":"5985d48b2183e8adf622262109ebcff1a4e8e390048dd9deee1856d65741f4d0"},"schema_version":"1.0","source":{"id":"2606.07692","kind":"arxiv","version":1}},"canonical_sha256":"d36593da982d826d844a1318dc6db8e5da17f26ecce97c22ff5a97d8cb49d164","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d36593da982d826d844a1318dc6db8e5da17f26ecce97c22ff5a97d8cb49d164","first_computed_at":"2026-06-09T00:04:47.010232Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-09T00:04:47.010232Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"90p6MZeMzSjj748bV+y7PVtGEgtNwXKzmEuyxaiI5CVu1Wx1H1HyiPKyssTN7/JLIhqwFGUpbkOiEA1i67CsBQ==","signature_status":"signed_v1","signed_at":"2026-06-09T00:04:47.010635Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.07692","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7cf41afa496aff26d4d4ddfe1339f1acaf03064286702fc9f6e30a230a3277d2","sha256:1d2f605dfb59861a9db63b829d192d9a13e8b863e83954d398833d91de4febbc"],"state_sha256":"7da2fb0b7eae108a4bb6872dfe796d21cf3fdf23c4bffd7f0dd69e9d2fea9764"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Qsu0XpmgUZry7ncXiKlzjpZF3x0KtLoqiZGx0IiwvHdHpn6C2629JOBYcy4GynwH/jWYYnbs7cOcwZaVkj5XDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-02T10:58:48.543189Z","bundle_sha256":"2f8fbadd071be9090b4ac47880a664dca2188096c8d13817104f7737592b5a6f"}}